Gravity

Gravity

Ver: 0

DESCRIPTION

Modifies the gravity term, which apperas as a volume force in the momentum equation.

The gravity force is described by its components in the reference frame of the problem. Two components, gx and gy (equivalently gr and gz in axisymmetric geometries), are needed for 2-D and 2-1/2-D flow problems ; three components, gx, gy and gz, are needed for 3-D flow problems.

Default : gx = gy = gz = 0

OPTIONS

-1
Upper level menu

The current values are accepted

1
Modification of gx

(In axisymmetric flows, gx = gr vanishes)

2
Modification of gy

(In axisymmetric flows, gy = gz is the axial gravity component)

3
Modification of gz

(Not available in planar flows)

NOTES A non-vanishing density must be specified when gravity is taken into account (see density).

The units for gx(r), gy(z) and gz are :

Parameter Mass Length Time Temperature

gx(r) - 1 -2 -

gy(z) - 1 -2 -

gz - 1 -2 -

SEE ALSO

Generalized Newtonian Flow (UM)
density
system of units

-1	Upper level menu
	The current values are accepted
1	Modification of gx
	(In axisymmetric flows, gx = gr vanishes)
2	Modification of gy
	(In axisymmetric flows, gy = gz is the axial gravity component)
3	Modification of gz
	(Not available in planar flows)

Parameter	Mass	Length	Time	Temperature
gx(r)	-	1	-2	-
gy(z)	-	1	-2	-
gz	-	1	-2	-